Free: Contests & Raffles.
It all depends on what bullet your barrel likes! what works for one persons ML may not work for yours! I have two TC's with identical barrels and I cant shoot the same bullets out of both! which really sucks cause that's why I bought the second one as a backup and now I have to have a completely different set up ready for the backup. Try many bullets and loads and go with the one your barrel likes best NOT the bullet that Joe Blow says is the best for him!
I've had some experience with powerbelts and in my opinion they are too soft, at least for elk. They also seem to foul the barrel with lead much more so than any other bullet I've tried. A good bullet to try if your barrel is designed to shoot sabots, is the Buffalo Bullet "Special Sabot Bullet" (SSB.) I have had good luck with this bullet in the 375 grain version in my T/C Black Diamond.